What a pretty ring!.
Very hard to tell what the pearl is from just one photo- though it looks like a cultured pearl. I hope it is possible for you to take some more photos with the ring on a matte white surface- ie a paper towel. Try photos from different angles and maybe daylight and artificial light. It is hard to tell the shape of the pearl from that photo- is it a button pearl? Do you know what the script is? Maybe Japanese? Maybe photo that, too.. We have both Japanese speakers and Mandarin speakers here, so a good photo of that part would help a lot.